Preheat the oven to 180°C
Line your brownie pan (Approx 33 23cm) with baking paper
Melt the butter and chocolate in a bowl over a saucepan of boiling water.
When the chocolate mixture has melted, let it cool
In a separate bowl beat together the eggs, sugar, and vanilla
Add the eggs and sugar mixture to the cooled chocolate and beat well
Add the flour and salt and mix well
Finally, add the chopped walnuts and mix well.
Place all the mixture in the brownie pan
Bake for about 25 minutes.
When the brownies are ready, the top should be dried to a paler brown, but the middle will still be dark and a dense gooey consistency.
Keep checking the brownies as they cook; remember that they will continue to cook as they cool.